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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 35,871 | $ 22,988
Capital loss carryforwards | 10,292 |
Deferred revenue | 1,167 | 1,564
Stock-based compensation | 534 | 732
Federal research and development tax credits | 1,058 | 1,058
Intangibles, amortization |  | 861
Inventories | 124 | 149
Other deductible temporary differences | 847 | 549
Total gross deferred tax assets | 49,893 | 27,901
Less: Valuation allowance | (42,117) | (27,568)
Deferred tax assets, net of valuation allowance | 7,776 | 333
Goodwill amortization | (11,276) |
Fixed assets, depreciation | (222) | (333)
Total deferred tax liabilities | (11,498) | (333)
Net deferred tax liabilities | $ (3,722) |

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